
If you want to see app virality up close, sign up for Trello and Asana and pay attention to what each product asks you to do next. Both grew to millions of users on the same insight: the fastest way to grow is to make the product spread by itself, from one person to a whole company, with almost no marketing in between.
These two apps are built for virality because they are most useful when teams collaborate around them. A task board is boring alone and powerful shared, so their product teams put the real effort into getting each new user to pull the rest of their organization in. Here is how that works, and why the same playbook still drives product-led growth today.








